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/**
* Parses a given string "option1;option2=value;option3=42;option4=false"
* into the following structure:
*
* {option1: true, option2: "value", option3: 42, option4: false}
*/
function parseOptions(string) {
const options = {};
let index = '';
let value = '';
let inval = false;
let escaped = 0;
let inquotes = false;
const l = string.length;
let token;
let write;
let skip;
for (let i = 0; i < l; i += 1) {
token = string[i];
write = false;
skip = false;
if (inval && token === '\\' && escaped <= 0) {
escaped = 2;
} else if (!inval && token === '=') {
inval = true;
skip = true;
} else if (inval && value.length === 0 && (token === '"' || token === "'")) {
inquotes = token;
} else if (inval && inquotes && escaped <= 0 && token === inquotes) {
inquotes = false;
} else if (!inquotes && token === ';') {
write = true;
skip = true;
}
if (!skip && escaped <= 0) {
if (inval) {
value += token;
} else {
index += token;
}
}
escaped -= 1;
if (write || i === string.length - 1) {
if (i === string.length - 1 && inquotes) {
throw 'Invalid data, missing closing quote';
}
if (index.trim().length > 0) {
options[index.trim()] = inval ? parseValue(value) : true;
}
inval = false;
inquotes = false;
index = '';
value = '';
}
}
return options;
}
/**
* Tries to parse a given string into it's appropriate type.
* Supports boolean, int and float.
*/
function parseValue(value) {
if (value.toLowerCase() === 'true') {
return true;
}
if (value.toLowerCase() === 'false') {
return false;
}
if (/^[+-]\d+$/.test(value)) {
return parseInt(value, 10);
}
if (/^[+-]\d+\.\d+$/.test(value)) {
return parseFloat(value, 10);
}
return value.replace(/^(["'])(.*)\1$/, '$2');
}
export default parseOptions;
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